fixes #20139; hash types based on its path relative to its package path (#21274) [backport:1.6]

* fixes #20139; hash types based on its path relative its project

* add a test case

* fixes procs

* better implementation and test case

---------

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

tests/ccgbugs/m1/defs.nim

@@ -0,0 +1,4 @@
+type MyObj* = object
+  field1*: int
+  s*: string
+  ch*: char

tests/ccgbugs/m2/defs.nim

@@ -0,0 +1,4 @@
+type MyObj* = object
+  s*: string
+  field1*: int
+  ch*: char

tests/ccgbugs/t20139.nim

@@ -0,0 +1,10 @@
+discard """
+  joinable: false
+"""
+
+# bug #20139
+import m1/defs as md1
+import m2/defs as md2
+
+doAssert $(md1.MyObj(field1: 1)) == """(field1: 1, s: "", ch: '\x00')"""
+doAssert $(md2.MyObj(field1: 1)) == """(s: "", field1: 1, ch: '\x00')"""